//abc.cpp 
#include<iostream>
using namespace std;
class Dog {
  public:
   Dog() {  wet=38; cout << "Wan wan! "; }  // constructor
  protected: int wet;  // so that can be used in GueiDog
  friend int main( );

};  // do NOT forget the ";"
class GueiDog : public Dog {
   public: GueiDog( ) { wet=49; cout << "貴賓狗! "; } // constructor

};  // do NOT forget the ";"

int main(  ) {
     Dog x;  Dog * x2;  // note that x2 is a pointer
     cout << "x.wet = " << x.wet;
     cout << endl << "Ha ha ha 來個 GueiDog:\n";
     GueiDog y;
     cout << "y.wet = " << y.wet << endl;
     cout << "------\n";
     x2 = new Dog( );  // 這時才生出 Dog
}//main(
/******
D:\COURSE\OOP> g++ abc.cpp

D:\COURSE\OOP> a.exe
Wan wan! x.wet = 38
Ha ha ha 來個 GueiDog:
Wan wan! 貴賓狗! y.wet = 49
------
Wan wan!
D:\COURSE\CS001\talk>
*******************************************/